Steam rock-drill



(No Model.)

AJ. W. v. RAWLINS;.

STEAM ROCK DRILL.

Patented July s, 1883.

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euren Stains Ari-zur @ri-rice..

Josera W. nAWLiNs, or HoUGHToN, Niemann.'

STEAM RGK-DRILL.

s, ieee.

Application led March 12, 1HS3. (No model.)

To aZZ whom it may concern.:

Be it known that l, J osnrn YV. Y. Rlwmns,

4a citizen ot' the United States, residing at -that its cutting-points may be presented in different positions at each succeeding stroke.

VIn the `operation of drilling it frequently hapl pens that the drill-points strike an oblique l blow, which tends with such force to turn the l drill that in machines as at present constructed there is const-ant danger ot' breaking the l mechanism by which the drill is rotated.

improved means for eiectually rotating the drill, and by which the danger of breakage incident to striking an oblique blow will be en- .coi

.ing bar is rounded and furnished with flange tirely avoided.-. This object l have accomplished by the mechanism hereinafter described, illustrated in the accompanying drawings, and particularly defined in the claims at the end of the specification.

Al `igure l is a View iu vertical section ol'a portion of :truck-drilling machine embodying my invention. Fig. :lisaviewintransverse section l online .r r of Fig. l. Fig. 3 is a vieu;Y in transverse section on line xiv, (parts being left in elevatiom) showing the position of the ratchet and connected mechanism when operating the ratchet-wheel for rotating the drill. Fig. 4 is' a detail top View of the main piston with the bushing to receive the turning-bar. A designates the main cylinder of the drilling-machine, which is provided with the usual induction and eduction pipes i'or steam or conipressed air, and has its lower end closed by a cap, A', through which passes the drill-stock B, keyed to the main piston C. This main piston is bdred out centrally, as shown at c, to permit its free movement upon asquare turn-A ing bar, D, which flts Within the bushing c of lthe piston. The upper portion of this turn- The object of this invention is to `provide 'which rests Within a seat in the bottom 'what I designate the ratchet-casing77 E, which is bolted by lugs e to suitable lugs not shown) upon the sides ofthe main cylin-v der. In the top et of the casing E is journaled the end ot' the turning bar, and within this casing, and firmly keyed to the turning bar, is held the ratchet-Wheel F, which, when moved, serves to impart rotation to the turning bar, and consequently-to the main piston, the drillstock, and the drill. The movement of vthis ratch et-W'heel is effected by m cans ofthe ratchet G, journaled to` the hinge-piece G', carried by the ratchet-piston H, moving within the supplemental cylinder H', which is preferably formed integral with the casing E, and the ends of which are closed by the threaded caps h hf. The piston H is formed, as shown, with the bore if', in which tits 'the rod I, which is held by the cap h, and carries the spiral spring K, the ends of which. rest within sockets in said cap and piston.

In the bottom of the ratchet-casing, as shown in dotted lines, l, 2, and 3, is formed the steam-passage L, which, .by the ports Z and l', connects the front end of the supplemental cylinder H with the top ofthe main cylinder A.' Upon the inside of the ratchet-casing is formed the stud M, which serves to retain the ratchet out oi' gear with its wheel when the ratchetpiston is,.in the forward part of the cylinder, as shown in Fig. 2 of the drawings. A spring, mi, attached to the side of the casing, forces the ratchet into gear when released from the stud.

From the construction of parts as thus deined the operation will be seen to be as follows: As the main piston approaches the end of its back stroke, it is met by th'e steam issuing through the upper induction-port, and is forced forward again. At the same moment steam issues from the main cylinder through the passage L into the supplemental cylinder, and in so doing forces back the supplement-al piston, thus compressing the spiral spring K and causing the ratchet to impart to its ratchet- Wheel a parti al revolution, which is communi-` cated to the turning bar, the main piston, and the drill. Vlfhen the steam is exhausted from the main cylinder, it is also exhausted from the supplemental cylinder, and by the connection shown ot the paivl to the supplemental pist-on IOO no steam is allowed to pass into the ratchetwheel chamber. lThe spiral spring now at once forces the ratchet-piston forward, and the end of the ratchet strikes and p. ases beneath the sueeeeing stroke. that the main piston is' i .of striking an oblique blow the sind M, ann is thus thrown out of gear with me ratehet-Wheel, and so .reina-ins until It will thus be seen lree to revolve in case at any time, therebyalvoiding all (longer o'brealiing the nieolr :mism whereby the rotaion ofthe drill is ei'- feoted. A A Y 1 Althongh have sta-heil in the foregoing de soripiaion what I regard as nient of my inveniionfit 'ill be readily under- Stoody by those skilled in the arthah it may be niodiiied Wil-iront departing from the spirit of .the niention, angl I do not Wish to be un derstood therefore as restricing myself to Jfhe precise details. set ont.

Having jLilus described my invention, what I claim as new, and desire to seni-ire b5' Letters Patent, is` Y l. In rgoolodrills, the combination, with the main oyli nder and piston, or' a turning bar, a retehet-Wheel keyed to said bar, a supplemental Cylinder and pis'lon, and a ratrhet for turning the i'ziiolietii'lieel connected io the sido ofthe supplenienal piston, substantially as (lescribed. Y A

13. In a rook-drill, the Combination, with the ina-in and supplemenlal pistons and the 'ruin ing' bar, of nierhanisni [or revolving said iurning'bar and means lor automatically disconneotingsaid revolving mechanism from the Vturning br, substanfsially as' described.

el. The combination, with the mainCylinder` "Emil pison, of n turning bar, i ratchet-Wheel, a ratchet, and a spring piston 'for aotuning said ratchet, substantially as described.

The conilinariou, wiili the main cylinder and piston, oi' the i'nrning bar, the ratchet` Wheel, the ratchet, ille supplemental cylinder and spring-seated ratchet-piston, and a pasf ehannel oniieetinsrsairl main and supplemental @'liiilloifs, subsianti al ly described'.

l5. The ooni'winaiion, with ihemain cylinder and piston, ol' ihe turning hai-2 the ratchet- Wheol, i'lxerarhet and mechanism for operat-- ing' thesanie, and 'he ratchet-rasiiig provided with a sind for holding' he ratchet out of an Li tion. subsnniially as described.

JOSEPH vll'. RUV'MNS. Vil nemesi:

XV. i). filmini'. (licencia (E Snininnx.

and

-seared supplemental 

